Apocrita

Apocrita are Hymenoptera whose abdomen and thorax are separated by a narrow part, giving them a "wasp waist". Females that use an ovipositor to lay eggs and are called parasitoid wasps. When the ovipositor has changed into a stinger, the animal is classified as Aculeata. Bees and wasps are Apocrita Aculeata. Ants are also Apocrita Aculeata, even though the stinger has disappeared in some subfamilies.